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草业学报 ›› 2023, Vol. 32 ›› Issue (10): 247-256.DOI: 10.11686/cyxb2022464

• 研究简报 • 上一篇    

白花草木樨结瘤缺失型突变体的结瘤表型及生物量分析

王升升(), 段珍, 周培, 张吉宇()   

  1. 兰州大学草地农业科技学院,兰州大学草种创新与草地农业生态系统全国重点实验室,甘肃 兰州 730020
  • 收稿日期:2022-11-25 修回日期:2023-01-12 出版日期:2023-10-20 发布日期:2023-07-26
  • 通讯作者: 张吉宇
  • 作者简介:E-mail: zhangjy@lzu.edu.cn
    王升升(1996-),女,甘肃天水人,在读博士。E-mail: shshwang21@lzu.edu.cn
  • 基金资助:
    国家自然科学基金(32061143035);内蒙古自治区种业科技创新重大示范工程“揭榜挂帅”项目(2022JBGS0040);兰州大学中央高校基本科研费-优秀青年支持计划项目(lzujbky-2022-ey17)

Phenotype and biomass analysis of nodulation-deletion mutants in Melilotus albus

Sheng-sheng WANG(), Zhen DUAN, Pei ZHOU, Ji-yu ZHANG()   

  1. College of Pastoral Agriculture Science and Technology,Lanzhou University,State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems,Lanzhou 730020,China
  • Received:2022-11-25 Revised:2023-01-12 Online:2023-10-20 Published:2023-07-26
  • Contact: Ji-yu ZHANG

摘要:

为研究草木樨共生固氮的形成机制,以白花草木樨野生型Ma389经甲基磺酸乙酯(EMS)诱变后的Ma58、Ma61和Ma62结瘤缺失型突变体为材料,接种苜蓿中华根瘤菌SM1021后对其结瘤表型和生物量进行了分析。结果表明:突变体Ma58、Ma61不形成侵染线和根瘤原基,突变体Ma62不形成侵染线,且只形成少数不固氮的白色小根瘤。3种突变体在低氮基质中生长30 d时,根鲜/干质量显著低于野生型(P<0.05),从40 d开始,地上部鲜/干质量、根鲜/干质量、株高和根长均显著低于野生型(P<0.05),在富氮基质中则无显著差异,表明这3种突变体的突变基因只与共生固氮相关,为草木樨共生固氮机制研究奠定了遗传材料基础。

关键词: 白花草木樨, 结瘤缺失型突变体, 共生固氮, 生物量

Abstract:

In order to elucidate the mechanism of symbiotic nitrogen fixation of Melilotus, nodulation-deletion mutants Ma58, Ma61 and Ma62 induced by ethylmethane sulfonate (EMS), and wild-type Ma389 of Melilotus albus were studied and the nodulation phenotypes and biomass were analyzed after inoculation with Sinorhizobium meliloti SM1021. It was found that mutants Ma58 and Ma61 did not form infection lines and nodule primordia, while mutant Ma62 did not form infection lines and only formed a few small white nodules which did not fix nitrogen. The root fresh/dry weight of the three mutants was significantly lower than that of the wild type in low nitrogen substrate for 30 d (P<0.05), and the aboveground fresh/dry weight, root fresh/dry weight, plant height and root length were significantly lower than those of the wild type from 40 d (P<0.05). However, no significant differences were found when plants were grown in a nitrogen-rich substrate, indicating that the mutant genes of the three mutants were related only to symbiotic nitrogen fixation. This study has identified genetic resources for the study of the symbiotic nitrogen fixation mechanisms of Melilotus.

Key words: Melilotus albus, nodulation-deletion mutants, symbiotic nitrogen fixation, biomass